Abstract

: This paper suggests how an optimal
operation of a photovoltaic pumping system based on an
induction motor driving a centrifugal pump can be
realized. The optimization problem consists in
maximizing the daily pumped water quantity via the
optimization of the motor efficiency for every operation
point, which has led to an optimum ‘ v-f ’ relationship
useful in controlling the motor. This is reached via the
control of a natural PWM VS inverter feeding the motor.
The effectiveness of the proposed algorithm is described
by simulation and the obtained results are compared to
those of a system working with a constant air gap flux.
The obtained results allow the improvement of the daily
pumped water quantity and the pump efficiency. In
addition, the influence of changing array temperature is
also discussed.